title: Superconductivity at 23 K in Pt doped BaFe₂As₂ single crystals.
abstract: We report superconductivity in single crystals of the new iron-pnictide system BaFe(1.90)Pt(0.10)As(2) grown by a self-flux solution method and characterized via x-ray, transport, magnetic and thermodynamic measurements. The magnetic ordering associated with a structural transition at 139 K present in BaFe(2)As(2) is completely suppressed by substitution of 5% Fe with Pt and superconductivity is induced at a critical temperature T(c) = 23 K. Full diamagnetic screening in the magnetic susceptibility and a jump in the specific heat at T(c) confirm the bulk nature of the superconducting phase. All properties of the superconducting state-including the transition temperature T(c), the lower critical field H(c1) = 200 mT, the upper critical field H(c2)≈ 65 T, and the slope ∂H(c2)/∂T-are comparable in value to those found in other transition metal-substituted BaFe(2)As(2) series, indicating the robust nature of superconductivity induced by substitution of Group VIII elements.
authors.affiliation: Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742, USA.
authors.forename: S R
authors.initials: SR
authors.lastname: Saha
authors.forename: T
authors.initials: T
authors.lastname: Drye
authors.forename: K
authors.initials: K
authors.lastname: Kirshenbaum
authors.forename: N P
authors.initials: NP
authors.lastname: Butch
authors.forename: P Y
authors.initials: PY
authors.lastname: Zavalij
authors.forename: Johnpierre
authors.initials: J
authors.lastname: Paglione
mesh_terms: D017609:Barium Compounds / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D003460:Crystallization; D004553:Electric Conductivity; D005296:Ferrous Compounds / Q000737:chemistry*; D008280:Magnetics; D010984:Platinum / Q000737:chemistry*; D013696:Temperature
chemical_list: D017609:Barium Compounds; D056831:Coordination Complexes; D005296:Ferrous Compounds; D010984:Platinum